A terrorist cell that attacked and killed more than a dozen people at a Christmas market in Germany last month was led by a young Saudi-born Muslim convert to Islam, police said Wednesday.
Police in the eastern German state of Lower Saxony arrested a 17-year-old Saudi Arabian man on Wednesday, but did not release his name.
Police say he was not the primary driver of the car that crashed into the Christmas market on Christmas Eve, killing 13 people and injuring more than 200.
Police did not identify the suspect.
A second person has been arrested and is being questioned about the crash.
Police also said that the driver of a third car that was involved in the crash had been released from custody.
Authorities said the Saudi-led cell was led in December by Abu Muhammad al-Maqdisi, a 25-year old from the northern city of Mina, who is also known as Abu Al-Abbas al-Maghribi.
The group is linked to al-Qaeda, and al-Masri said he believed the Saudi group was seeking to launch an attack on German soil.
German Chancellor Angela Merkel and President Joachim Gauck expressed condolences for the victims of the attack and vowed to take strong action to stop the attack.
Police said the driver and a third passenger were not known to each other.
Police have arrested another Saudi-based man in the attack, identified as Saif al-Batsh.
He is still at large.
The attacks were the latest in a wave of attacks in Germany that have been attributed to Islamic extremists.
In September, a German man stabbed a police officer with a kitchen knife and drove his car into a Christmas Market in the city of Wuppertal.